Accordingly to the law:
Article 116 RGIT – Lack or delay of declaration
1 — The lack of declarations that for tax purposes must be presented so that the tax administration specifically determines, evaluates or proves the taxable amount, as well as the respective provision outside the legal deadline, is punishable by a fine of €150 to €3 750.
The law is silent on how they will calculate the actual penalty given the wide variance. It is worth noting that in Portugal when it comes to tax returns, normally the statute of limitation is 4 years. However under certain circumstances the tax authority may be able to pursue a case even after the 4 year period has passed
Bottom line – get advice from qualified professionals before making a decision either way.


